Marine Articles

Stay updated on the latest blog posts from DMS.  Everything from videos to technical articles, the latest software, and so much more.    

Stability Fails at Seakeeping

Stability and seakeeping are frequently misunderstood. To understand the limits of these sciences, we must unveil the motivation behind their development. How to guarantee ship safety on an uncertain ocean?

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Hydrodynamics and Hull Design

A refined hull shape epitomizes the link between tradition and science. When we link the science of ship design with the experience of past ships, we identify the successes and isolate previous failures. This article glimpses into the background of hydrodynamics by exploring the link between the science of Bernoulli’s equation and the shape of ship hulls.

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Video: Selecting the Right Hullform

Monohull, catamaran, trimaran . . . so many choices. Which hullform to pick? Can we draw upon any science to guide our choices, or we beg Lady Luck to guide us? This article provides a rational and design map for selecting hullforms applicable to any type of mission. This organized approach allows us to see past the limitations of historic examples and consider new alternatives.

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How Many Tons in a Pound?

How man tons in a pound? When ships weigh thousands of tons, you really need to know which type of ton. So take five minutes and get clarity on the esoteric measurements of ship design.

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Six Tip to Improve Your FEA

An experienced engineer doesn’t have some magic button to deliver great FEA. Masters of FEA trade-craft hoard many little tricks and nuggets of wisdom to deliver better FEA. These tricks yield better ways to detect human errors and ensure model reliability. Or methods to deliver faster results. Today we share six nuggets of wisdom for better FEA.

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Splitting Waves and Hairs: Comparing X-Bow, Axe Bow, and More

Axe bow, X-bow; slim size, thin size.  We currently enjoy an explosion of variety in bow shapes, each suited to a different task.  These may all look the same with a cursory glance, but don’t get fooled.  Nearly the same bow shape, used on a different vessel may work...

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How do I Select the Right Hull?

Monohull, catamaran, trimaran . . . so many choices.  Which hullform to pick?  Can we draw upon any science to guide our choices, or shall we beg Lady Luck to guide us?  Although hullform selection does involve some experience and artistic preference, naval architects...

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Go FAST Boat: Pros and Cons of a Planing Hull

ZOOM!!!  No better way to describe planing boats.  They pack very fast speeds into a very small package.  Many planing boats achieve speeds well beyond the limits of larger craft.  How do they do it?  And what are the penalties for this extreme speed?  Discover if a...

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Smooth Sailing: Pros and Cons of a SWATH Vessel

Welcome to luxury cruising.  Glide above the waves without any jerky motions.  Walk about your accommodation deck, unhampered by nasty rolling motions.  If this temps you, come realize the dream of the SWATH vessel.  But it comes at a price.  Discover if this unique...

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Why You Want a Trimaran: Pros and Cons of a Trimaran

Three hulls are better than one!  That would be the adage of the trimaran.  It consists of one central hull with two smaller side hulls, called amas.  The average person conceives of the trimaran as something even more extreme than catamarans.  Lighter weight, higher...

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Six Keys to Better Marine FEA

Tips to Improve Your FEA Model No matter how much work you do in finite element analysis (FEA), there is always room for improvement.  Masters of FEA trade-craft hoard many little tricks and nuggets of wisdom to deliver better FEA.  These tricks yield better ways to...

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Trust Your Singularity

Why FEA Singularities Are Acceptable https://youtu.be/-OHXl-mvR5U 1.0 Introduction You stare in dread at the FEA results, which show unbelievable stresses in small spots at the corners.  Don’t panic; they are only stress singularities.  Small regions where the FEA...

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